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Power | Telecom |
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Integration of Mobile Communication and “3S” Techniques in Electric Power Monitor System
3.3 SCM and the OS
In order to get the more excellent capability, we use the ARM chip as the CPU of the SCM. ARM (Advanced RISC Machines) is a well-known microprocessor company. It designs a great deal of high capability, cheap, lower consume energy RISC processor and relative technique and soft. The ARM chip is 32 bit CPU, and the traditional 51 chip is 16 bit CPU. The ARM chip has characteristic of high capability, cheap, lower consume, so it can be used in many realm such as embed control, consume/education multimedia, DSP and mobile application and so on. The form of ARM is the first RISC microprocessor designed for lower budget market. Using the form of ARM can reduce the time to develop and test the program, and reduce the cost of development.
The VxWorks OS is a embedded real-time operate system (RTOS) which designed by WindRiver US in 1983. It is the crucial element of the embed develop environment. It has good developable ability, high performance inside and friendly develop environment. It has been used in many high technique realms, such as communication, military, aviation, and space flight, for its dependability, real time. Compared with time-sharing operate system, the VxWorks which is a embedded real-time operate system can complete stated job, and give respond to outside matter in stated time. Using the VxWorks in our system, we can get reliability, real time, multitask, and occupy attempter and so on.
3.4 GSM data sending and receiving
The GSM communication module can achieve the GSM data sending in the terminal and receiving in the host. It uses the standard GSM secondary development module, such as TC35, FALCOM, and WISMO3 etc. All these communication module have all of the function of the GSM communication, and afford standard UART interface. They all support the AT commands defined in the GSM 07.05. So the MCU can easily connect the GSM module through UART interface, and use the AT commands to realize the sending and receiving of 7message.
The SMS transmission has three kind of modes: Mode of Block, Mode of Text based on the AT command, Mode of PDU based on the AT command. We use the mode of Text because the single data is very short. There are the examples below. This program made by BASCOM-AVR advanced language.
3.4.1 Send text message
PRINT "AT+CSCA=";Chr(34);"+8613800431500";Chr(34) ‘Set the number of message center
PRINT "AT+CMGF=1" ‘Set Mode = Text
PRINT "AT+CMGS=";Chr(34);"13504462390";Chr(34) ‘Set the aim number
PRINT "This is a test";Chr(26) ‘“This is a test”is the content
“PRINT” means sending the text thought the URAT.
3.4.2 Receive text message
If the GSM module receives a new message, there information will return from UART information.
+CMGR:"RECUNREAD","+8613504462390",,"02/10/16,15:37:28+32,xxxxxxx
(xxxxxxx is the content )
The MCU send out AT command to the GSM module thought UART, and it can read the message received directly.
PRINT "AT+CMGR=1" ‘receive a message
3.5 GIS System
The GIS system is programmed by secondary development technique in the server host. The system mainly uses the techniques of Delphi, Arc Object and Oracle. Delphi is the mainly program language. It is very convenient, smart, short time, so it is very suitable to complete secondary development. Arc Object is a very good ActiveX control produced by ESRI Company for the GIS system secondary development. It has powerful function, can easily to program the high quality GIS soft.
4. Conclusion and further research
Being a kind of bold viewpoint, considerate conceive, detailed programming, the construction of the “3S” pipeline monitor net in electric power profession that based on the mobile communication technique has imported a new method and a new developing space in the development of recent GIS. The adoption of mobile communication technique (especially the SMS )has made up for the shortcomings of the traditional “3S”, and at the same time it also satisfied the request of the new research realm. In the practical adoption process, the “3s” platform based on mobile communication has played an important role. In the process, the data collected by terminal sensor can be transformed to the server host swiftly, and the real-time display and disposal of data information can be realized. It had a favorable result in practical utility. This system discussed the construction of the “3S” pipeline monitor net in electric power profession based on the mobile communication technique, but obviously, it can be transplanted easily. It can also be transplanted to other systems, such as the trouble control in electric power profession and the hydrological management in valleys.
Our main goal is to import the mobile communication technique into the “3s” system, so as to enlarge the applied scope of “3s”. The further research will improve the arithmetic and use advanced technique. In order to perfect the system, we should optimize the speed of it, strengthen the time-limited efficacy and overcome the limit of GSM network, such as the transfer errors and the time delay. Other improvement will easily transplant the system to GPRS network that belongs to 2.5G technologies, and the cost of this equipment is very low, you needn’t worry about the interference of frequency, and furthermore, it needn’t be protected by special platform. It can satisfy the guests’ request in the area of the control of pipeline monitor net in electric power profession to long-distance data transformation. With the prevalence of GPRS network, such scheme based on GPRS data network will be more and more popular.
References
- Thomas Kyte. Effective Oracle by Design (Osborne ORACLE Press Series). McGraw-Hill Osborne Media. August 21, 2003
- Jaclyn Easton. Going Wireless: Transform Your Business with Mobile Technique. HarperCollins Publishers, Inc. 2002
- Michel Mouly, Marie-Bernadette Pautet. The GSM System for Mobile Communications.
- M. Bezler et al. GSM base station system. Electrical Communication, 2nd Quarter 1993.
- Dale Depriest. A Gps User Manual: Working With Garmin Receivers. Authorhouse Publishers, Inc . June 1, 2003
- Joseph J. Carr. Sensors & Circuits: Sensors, Transducers, & Supporting Circuits For Electronic Instrumentation Measurement and Control [FACSIMILE]. Pearson Education POD. July 14, 1997
- T. Sridhar, T. Sridar. Designing Embedded Communications Software. CMP Books. July 2003
- Dhananjay Gadre. Programming and Customizing the AVR Microcontroller. McGraw-Hill/TAB Electronics. September 18, 2000
- Klaus-Peter Koehn. The Microcomputer System: Single-chip Microcomputers. John Wiley and Sons Ltd. 1984
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